Island



(No Model.)

N. G. HERRESHOFP.

STEAM BOILER.

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,v UNITED STATES PATENT GEFICE.

NATI-IANIEL GREENE I-IERREsI-IOEROE BRISTOL, RI-IODE ISLAND, As/sIGNOR To THE HERREsI-IOEE MANUFACTURING COMPANY, oEsAME PLACE.

vSTEAM-BOIIER SPECIFICATION forming part of Letters Patent No. 605,785, dated Junel 14, 1898.

' A'ppiicaitn filed vseptember 2s, 1897. seria No. 653,288. (No model.)

ToctZZ whom t may concern: y

Be it known thatI, NATHANIEL GREENE HERRESHOFF, a citizen ofthe United States,

residing at Bristol, in the county vof Bristol and' State of Rhode Island, have invented a certainnew and useful Improvement in'Steam-Boilers, of which the following is a specification.A

My improvement relates yto dry-steam separators, and is intended for use in connection with steam-boilers more especially designed for steaml vessels of moderate size, as yachts r and torpedo-boats, and I will describe it as thus applied; but it may be of service in many other situations. l l Y I provide for efficiently-separating the unevaporated water from the steam and returning it to the boiler at points below the water,-

line, so that I can obtain practically dry4v steam from a boiler with a iire vigorously forced.

I have illustrated my invention as applied to what is known as the Du Temple form of boiler, in which the nre-surface is presentedA n mainly by tubes more or less bent and consection, and Fig. 2 a transverse vertical sec- Fig. 3 shows,

tion on the line '2 2 in Fig. l. on a larger scale, a partial section corresponding to Fig. 2, but with the series of inclined deiiectors in,elevation not sectioned. The

steam-pipe is also omitted to moreclearly show the perforated conical screen.

Similar letters of Areference indicate corresponding parts in all' theviigures where they appear. A v

A is a dome on the boiler shell or drum A, providing an elevated space, from which the steam'is taken through an internal pipe .I and connected in the obvious manner. The liberal aperture obviously required in the upper portion of the cylindrical shell A to communi- Iof Ithe dome A.

Wet.

cate properly withlthe interior of the dome A' is of'less diameter than the interior of the dome, but' is much larger than the pipe J, which stands inthe center. A continuous series of inclined deiiectors P are mounted in ,the annular space thus provided, leaving a clear space above in which the steam traverses helicallyin'consequence of the inclination which its several particles have received in passing the deiiectors P below.

K is a conical 'strainer or foraminous sheet of thin metal arranged within the dome, as clearly shown in Figs. 2 and 3, and L L are :smallpipes leading down from the space outside of such' perforated conical screen and opening into the interior of theboiler-shell A at points below the water-line.

WVhen the boiler is in operation and steam is being taken away, it enters the pipe J at the top by traversing upward in theinterior As it ascends in the dome it is deiiected through the inclined passages and perform'sa helical movement. Y rIlhe centrifugal force ofthe particles of water which may be very liberally mingled with the steam when the steam is generated rapidly bythe re on my extended grate causes such denser particles to be separated from the steam by being thrown against Athe conical screen.

as such water'passes outward through this screen it is free to Iio'w down in the quiet angular space surrounding this screen, between .it and the interior ofthe dome, and it soon flows down quietly through the pipes L L and mingles with the water inthe boiler.

It willv be understood that my boilery may parts in that the broad grate extending under the Vlower drums B B generates much steam therein, requiring a large amount of dense `water flowing down the rear tubes C and sending up -water so mingled with steam through the small tubes C, thus attaining unusually rapid circulation with extraordinary efficiency, but delivering the steam unusually My peculiarlyl compact and efcient means for separating completes the coperative combination.

So soon- IOO I attach importance to the extension of the material of the upper drum A sufficiently inward within the base of the dome A to constitute the bottom of the annular space exterior to the conical foraminous screen K within the dome, for the ieason that it not only constitutes an efiicient support for said screen and for the pipes L and the annular series of inclined deilectors P, but also because it increases the strength of the drum A, causing it to become less weakened than it would be if the aperture in said drum were, a-s in ordinary boilers, the full size of the base of the dome.

Modiiications may be made without departing from the principle or sacrificing the advantages of the invention. I have shown two tubes L L. One may sufiice oi more may be used. They perform the important function of providing a passage through which the water separated from the steam in the dome may quietly descend and mingle again with the water in the boiler. The lower end being below the lowest water line of the boiler avoids any possibility that steam can rise through that passage, and thus create a steamcurrent in opposition to such descent.

I do not in this patent claim the broad grate in a plane below the side drums and extending outward under the saine, because such is made the subject-matter of a separate application for patent iiled September 2S, 1807, Serial No. 653,287; neither do I claim in this patent the peculiarities of the furnacewall and the provisions for preventing back draft, such being made the subject of a separate application for patent led January ll, 1898, Serial No. 666,307.

I claim as my invention- 1. In a dry-steam separator, a dome or inclosing casing, a dei'lector located at the base thereof, presenting an inclined passage to impart a helical movement to the ascending current of steam and leaving a circular clear space above said deiiector, in combination with a foraminous screen K, in the interior near the periphery of the dome or casin g, and against the inner face of which the steam is whirled in circulating contact, a lower waterdiscliarge external to the screen, and a drysteam-eduction pipe leading from the upper part of the dome or casing, substantially as herein specified.

2. In a dry-steam separator, a dome or inclosing casing closed at the top, a delector located at the base thereof, presenting an inclined passage to impart a helical movement to the ascending current of steam and leaving an annular clear space above said deilector, in combination with a foraminous screen K extending around in the interior near the periphery, a lower water-discharge external to the screen, and a drysteam eduction pipe leading downward from the upper part of the dome or casing in the axis thereof, substantially as herein specified.

3. In combination with a steam-boiler having a water-surface insufficient for the proper disengagement of the steam, the dome A' extending upward from the body of the boiler, the steam-pipe .I extending downward from near the top in the center of the dome, a foraminous screen K in the interior near the pcriphery of the dome leaving an annular space exterior thereto, a pipe L leading downward from such exterior space to a point below the water-level in the boiler, and a series of inclined deiiectors P arranged in the bottom of the annular space between such screen and the central pipe leaving the upper portion of such space clear, adapted to impart a helical motion to a large quantity of steam ascending therethrough while requiring little Vertical height in the series, all arranged for joint operation substantially as herein specified.

4c. In combination with a steam-boiler having a water-surface insufiicient for the proper disengagement of the steam, the dome A extending upward from the body of the boiler, a pipe J extending downward in the center, the foraminous screen K in the interior near the periphery of the dome, leaving an annular space exterior thereto, the pipe L leading downward from such exterior space to a point below the water-level in the boiler, and a substantially annular series of inclined deflectors P arranged in the base of the dome between such screen and the central pipe, vadapted to impart a helical motion to the steam ascending therethrough leaving an unobstructed space above such detlectors in which the particles of water may freely move tangentially to reach the screen, all substantially as herein specified.

5. In a steam-boiler, a dome A covering a portion of the drum or body A outside of the aperture for such dome and a foraminous screen K extending around within the dome and joined to the body at the edge of the apertu re,in combination with a series of inclined defiectors P arranged to cause the steam rising through it to travel helicallyin a clear space above so that the iiiclosin g foraminous screen shall receive the particles oi' water and allow them to move outward through it and descend in a quiet space outside thereof, and one or more pipes L communicating between such quiet space and a point in the body or drum below the water-line, such pipes being set in the portion of the boiler-shell within the dome, all substantially as herein specified.

In testimony that I claim the invention `above set forth I ai'iix my signature in presence of two witnesses.

NATIIANIEL GltEllNll llllllllSllOlllf. lVitnesses:

C. W. YOUNG, Lnwis II. DE SToLi..

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